subject:"\[USRP\-users\] Hello,"

[USRP-users] Hello all;

2021-06-17 Thread rblack

My current gnuradio/UHD  install has the xml files for a number of RFNoc blocks 
in /usr/share/gnuradio/grc/blocks; e.g. uhd_rfnoc_radio.xml.

But I do not have such a file for the rfnoc replay block, even though I do have 
the rfnoc replay function in my firmware .bit load.  Does such a block exist? 
Also has anyone ever used the “replay block” in a grc flowgraph?

Currently I have UHD 3.15,  but will soon have v 4.0

thanks rb
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Re: [USRP-users] Hello,

2018-12-18 Thread Pablo González Fernández via USRP-users

Thanks Ian!

El vie., 14 dic. 2018 a las 17:25, Ian Buckley ()
escribió:

> N310 has a different ADI radio chip and since I did not work on the design
> I don’t want to give you misleading advice on that one.
> N210 is different, as it uses the standard Ettus interchangeable daughter
> board standard. Some daughterboards have features to fully phase align
> synthesizers after a retune, some not depending which chips they are based
> on. UBX for example can be fully phase aligned, but I don’t think WBX can.
> I don’t recall the full product matrix as to which daughter boards will
> fully align phase.
> -Ian
>
>
> On Dec 14, 2018, at 3:53 AM, Pablo González Fernández <
> pgonza...@gradiant.org> wrote:
>
> Thanks Ian. Am I correct to assume that this is not the case for N210?
> What about for the N310? I am not so sure in this case, as it uses an AD
> chip as the B210.
>
> Regards
>
> El mié., 12 dic. 2018 a las 15:26, Ian Buckley ()
> escribió:
>
>> Brais,
>> Sam sent you a little bit the wrong direction there, the B200mini has the
>> PLL phase noise issue that precludes use in a MIMO system.
>> The B210 can be fully time and frequency locked to an external 10MHz
>> reference and PPS.
>> What is slightly tricky about using multiple B210’s in a MIMO
>> configuration is that the internal frequency synthesizers will have a
>> residual phase ambiguity after they have been configured, and this must be
>> characterized and compensated for after any retune.
>>
>> Watch this to gain insight into the issues involved:
>> https://www.analog.com/en/education/education-library/webcasts/developing-multiple-input-multiple-output.html
>> -Ian
>>
>> On Dec 12, 2018, at 2:30 AM, Brais Ares via USRP-users <
>> usrp-users@lists.ettus.com> wrote:
>>
>> Thanks Sam! If I understand correctly the link that you refer to, it is
>> possible to obtain time and phase synchronization with B210s, so the only
>> issue would be to compensate phase offset which could be done by software.
>> Could you elaborate a little bit more? I'm probably missunderstading the
>> thread you link, but from it I take that MIMO implementations are possible
>> with B210. Also, can you provide any link for the difference between B210
>> and N210 that allows to use the later but not the former?
>>
>> Regards,
>> Brais.
>>
>> ___
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>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
>>
>
>
>

-- 

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Pablo González Fernández
Investigador - Desarrollador Senior | Área de Comunicaciones Avanzadas
Senior Researcher - Developer | Advanced Communications Department



Ph. (+34) 986 120 430  Ext. 3016
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Re: [USRP-users] Hello,

2018-12-14 Thread Marcus D. Leech via USRP-users


On 12/14/2018 11:24 AM, Ian Buckley via USRP-users wrote:
N310 has a different ADI radio chip and since I did not work on the 
design I don’t want to give you misleading advice on that one.
N210 is different, as it uses the standard Ettus interchangeable 
daughter board standard. Some daughterboards have features to fully 
phase align synthesizers after a retune, some not depending which 
chips they are based on. UBX for example can be fully phase aligned, 
but I don’t think WBX can.
I don’t recall the full product matrix as to which daughter boards 
will fully align phase.

-Ian


I confirm that the N310 can be made coherent, using 10Mhz REF and 1PPS, 
but with the usual phase-ambiguity proviso.


For N2xx, the SBX allows phase-resynch, and the WBX allows phase-resynch 
with a residual 0/180 phase ambiguity (again, 2XLO

  phase splitter).


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Re: [USRP-users] Hello,

2018-12-14 Thread Marcus D. Leech via USRP-users

On 12/14/2018 11:24 AM, Ian Buckley via USRP-users wrote:
N310 has a different ADI radio chip and since I did not work on the
design I don’t want to give you misleading advice on that one.
N210 is different, as it uses the standard Ettus interchangeable
daughter board standard. Some daughterboards have features to fully
phase align synthesizers after a retune, some not depending which
chips they are based on. UBX for example can be fully phase aligned,
but I don’t think WBX can.
I don’t recall the full product matrix as to which daughter boards
will fully align phase.

-Ian

I *think* that phase coherency across multiple N310s using common
reference and 1PPS will work, but I'm going to verify with

Ettus engineering.

There'll be the usual proviso that there won't be strict phase
alignment, mutual phase noise will be higher than with a shared-LO

approach, etc.

The N310 can accept an 2XLO input, but this has a 180deg phase
ambiguity, due to the 2X nature of the LO (The incoming LO is
at twice the desired tuned frequency, and the phase split has a 0/180
deg ambiguity).

On Dec 14, 2018, at 3:53 AM, Pablo González Fernández
mailto:pgonza...@gradiant.org>> wrote:

Thanks Ian. Am I correct to assume that this is not the case for
N210? What about for the N310? I am not so sure in this case, as it
uses an AD chip as the B210.

Regards

El mié., 12 dic. 2018 a las 15:26, Ian Buckley (>) escribió:

Brais,
Sam sent you a little bit the wrong direction there, the B200mini
has the PLL phase noise issue that precludes use in a MIMO system.
The B210 can be fully time and frequency locked to an external
10MHz reference and PPS.
What is slightly tricky about using multiple B210’s in a MIMO
configuration is that the internal frequency synthesizers will
have a residual phase ambiguity after they have been configured,
and this must be characterized and compensated for after any retune.

Watch this to gain insight into the issues involved:

https://www.analog.com/en/education/education-library/webcasts/developing-multiple-input-multiple-output.html
-Ian

On Dec 12, 2018, at 2:30 AM, Brais Ares via USRP-users
mailto:usrp-users@lists.ettus.com>>
wrote:

Thanks Sam! If I understand correctly the link that you refer
to, it is possible to obtain time and phase synchronization with
B210s, so the only issue would be to compensate phase offset
which could be done by software. Could you elaborate a little
bit more? I'm probably missunderstading the thread you link, but
from it I take that MIMO implementations are possible with B210.
Also, can you provide any link for the difference between B210
and N210 that allows to use the later but not the former?

Regards,
Brais.

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Re: [USRP-users] Hello,

2018-12-14 Thread Ian Buckley via USRP-users

N310 has a different ADI radio chip and since I did not work on the design I 
don’t want to give you misleading advice on that one.
N210 is different, as it uses the standard Ettus interchangeable daughter board 
standard. Some daughterboards have features to fully phase align synthesizers 
after a retune, some not depending which chips they are based on. UBX for 
example can be fully phase aligned, but I don’t think WBX can. 
I don’t recall the full product matrix as to which daughter boards will fully 
align phase.
-Ian


> On Dec 14, 2018, at 3:53 AM, Pablo González Fernández 
>  wrote:
> 
> Thanks Ian. Am I correct to assume that this is not the case for N210? What 
> about for the N310? I am not so sure in this case, as it uses an AD chip as 
> the B210.  
> 
> Regards
> 
> El mié., 12 dic. 2018 a las 15:26, Ian Buckley ( >) escribió:
> Brais, 
> Sam sent you a little bit the wrong direction there, the B200mini has the PLL 
> phase noise issue that precludes use in a MIMO system.
> The B210 can be fully time and frequency locked to an external 10MHz 
> reference and PPS.
> What is slightly tricky about using multiple B210’s in a MIMO configuration 
> is that the internal frequency synthesizers will have a residual phase 
> ambiguity after they have been configured, and this must be characterized and 
> compensated for after any retune.
> 
> Watch this to gain insight into the issues involved: 
> https://www.analog.com/en/education/education-library/webcasts/developing-multiple-input-multiple-output.html
>  
> 
> -Ian
> 
>> On Dec 12, 2018, at 2:30 AM, Brais Ares via USRP-users 
>> mailto:usrp-users@lists.ettus.com>> wrote:
>> 
>> Thanks Sam! If I understand correctly the link that you refer to, it is 
>> possible to obtain time and phase synchronization with B210s, so the only 
>> issue would be to compensate phase offset which could be done by software. 
>> Could you elaborate a little bit more? I'm probably missunderstading the 
>> thread you link, but from it I take that MIMO implementations are possible 
>> with B210. Also, can you provide any link for the difference between B210 
>> and N210 that allows to use the later but not the former?
>> 
>> Regards,
>> Brais.
>> 
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>> 
> 
> 
> 

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Re: [USRP-users] Hello,

2018-12-14 Thread Pablo González Fernández via USRP-users

Thanks Ian. Am I correct to assume that this is not the case for N210? What
about for the N310? I am not so sure in this case, as it uses an AD chip as
the B210.

Regards

El mié., 12 dic. 2018 a las 15:26, Ian Buckley ()
escribió:

> Brais,
> Sam sent you a little bit the wrong direction there, the B200mini has the
> PLL phase noise issue that precludes use in a MIMO system.
> The B210 can be fully time and frequency locked to an external 10MHz
> reference and PPS.
> What is slightly tricky about using multiple B210’s in a MIMO
> configuration is that the internal frequency synthesizers will have a
> residual phase ambiguity after they have been configured, and this must be
> characterized and compensated for after any retune.
>
> Watch this to gain insight into the issues involved:
> https://www.analog.com/en/education/education-library/webcasts/developing-multiple-input-multiple-output.html
> -Ian
>
> On Dec 12, 2018, at 2:30 AM, Brais Ares via USRP-users <
> usrp-users@lists.ettus.com> wrote:
>
> Thanks Sam! If I understand correctly the link that you refer to, it is
> possible to obtain time and phase synchronization with B210s, so the only
> issue would be to compensate phase offset which could be done by software.
> Could you elaborate a little bit more? I'm probably missunderstading the
> thread you link, but from it I take that MIMO implementations are possible
> with B210. Also, can you provide any link for the difference between B210
> and N210 that allows to use the later but not the former?
>
> Regards,
> Brais.
>
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>
>
>
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Re: [USRP-users] Hello,

2018-12-12 Thread Ian Buckley via USRP-users

Brais, 
Sam sent you a little bit the wrong direction there, the B200mini has the PLL 
phase noise issue that precludes use in a MIMO system.
The B210 can be fully time and frequency locked to an external 10MHz reference 
and PPS.
What is slightly tricky about using multiple B210’s in a MIMO configuration is 
that the internal frequency synthesizers will have a residual phase ambiguity 
after they have been configured, and this must be characterized and compensated 
for after any retune.

Watch this to gain insight into the issues involved: 
https://www.analog.com/en/education/education-library/webcasts/developing-multiple-input-multiple-output.html
-Ian

> On Dec 12, 2018, at 2:30 AM, Brais Ares via USRP-users 
>  wrote:
> 
> Thanks Sam! If I understand correctly the link that you refer to, it is 
> possible to obtain time and phase synchronization with B210s, so the only 
> issue would be to compensate phase offset which could be done by software. 
> Could you elaborate a little bit more? I'm probably missunderstading the 
> thread you link, but from it I take that MIMO implementations are possible 
> with B210. Also, can you provide any link for the difference between B210 and 
> N210 that allows to use the later but not the former?
> 
> Regards,
> Brais.
> 
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Re: [USRP-users] Hello,

2018-12-12 Thread Brais Ares via USRP-users

Thanks Sam! If I understand correctly the link that you refer to, it is
possible to obtain time and phase synchronization with B210s, so the only
issue would be to compensate phase offset which could be done by software.
Could you elaborate a little bit more? I'm probably missunderstading the
thread you link, but from it I take that MIMO implementations are possible
with B210. Also, can you provide any link for the difference between B210
and N210 that allows to use the later but not the former?

Regards,
Brais.
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Re: [USRP-users] Hello,

2018-12-11 Thread Sam Reiter via USRP-users

Hey Brais,

Check out this thread:
http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2017-May/052761.html

It looks like the PLL mechanism used to discipline the onboard oscillator
results in enough phase noise to preclude its implementation in a MIMO
setup. At least in a setup that spans multiple devices.

Sam Reiter
SDR Support Engineer
Ettus Research

On Tue, Dec 11, 2018 at 8:34 AM Brais Ares via USRP-users <
usrp-users@lists.ettus.com> wrote:

> Why is the b210 USRP not recommended for use with octoclock for
> synchronizing several USRPs according to table 4 in [1]? is it still
> possible to do it?
>
> [1] https://kb.ettus.com/Selecting_an_USRP_Device
>
> Regards,
> Brais.
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[USRP-users] Hello,

2018-12-11 Thread Brais Ares via USRP-users

Why is the b210 USRP not recommended for use with octoclock for
synchronizing several USRPs according to table 4 in [1]? is it still
possible to do it?

[1] https://kb.ettus.com/Selecting_an_USRP_Device

Regards,
Brais.
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[USRP-users] Hello all;

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